✦ LIBER ✦

What is a transition?

✍ Scribed by Bain, Alex D. ;Fletcher, D. A. ;Hazendonk, Paul

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 198 KB
Volume: 10
Category: Article
ISSN: 1043-7347
DOI: 10.1002/(sici)1099-0534(1998)10:2<85::aid-cmr2>3.0.co;2-r

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✦ Synopsis

The concept of a transition is the basis of spectroscopy. It is the observable associated with a jump from one energy level to another in a quantum-mechanical system. In NMR, this is often viewed as the flip of a spin with quantized energy levels in a magnetic field. This is perhaps acceptable for simple systems, but for situations with strong scalar couplings, or dynamics, it is not sufficient. This article explores some of the many concepts of a transition. In particular, it shows the validity and power of the idea of magnetization being flipped into the xy plane, precessing at its natural frequency, then being detected. This remains true, even in complex systems.

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